How to Choose a High-Quality Ruby Stone: Color, Clarity, Cut, and Certification

A natural Ruby can vary significantly in quality, beauty, rarity and price. Two Ruby stones of the same carat weight may look similar at first glance, yet have very different values because of their color, clarity, cut, treatment status, origin and certification.

So, how do you choose a high-quality Ruby stone?

The best approach is to evaluate the Ruby using four important factors: color, clarity, cut and certification. You should also check whether the Ruby is natural or synthetic, whether it has undergone treatment and whether any claimed geographical origin is supported by a reliable gemological report.

This guide explains what to look for before you buy a natural Ruby stone for astrology, jewellery or personal use.

1. Check the Ruby's Color First

Color is one of the first things you will notice when evaluating a Ruby.

Rubies belong to the corundum mineral family, and their characteristic red color is associated primarily with chromium within the crystal structure.

A Ruby's color can be evaluated through three main characteristics:

Hue

Hue describes the basic color you see.

Fine Rubies typically show a dominant red appearance, although some may have secondary purple, pink or orange tones.

For many buyers, a rich and balanced red is more desirable than a stone that appears overly brown, purple or dark.

Tone

Tone describes how light or dark the Ruby appears.

A Ruby that is too dark may lose brightness and appear almost black in low lighting.

A Ruby that is too light may appear closer to pink sapphire depending on laboratory classification and other characteristics.

A balanced medium to medium-dark tone can give a Ruby an attractive and lively appearance.

Saturation

Saturation refers to the strength or intensity of the color.

Highly saturated Rubies can display a vivid red appearance without excessive brown or grey tones.

When comparing stones, look for a Ruby that maintains an attractive red color under more than one type of lighting.

What Is "Pigeon Blood" Ruby Color?

The term "pigeon blood" is often used in the Ruby trade to describe a highly desirable vivid red color.

However, buyers should be careful with this phrase.

Not every bright red Ruby qualifies for a laboratory designation of pigeon blood, and sellers should not use the term casually to justify a higher price.

If a premium price is being charged because a Ruby is described as pigeon blood, check whether the terminology is supported by a recognised gemological laboratory.

2. Understand Ruby Clarity

Most natural Rubies contain inclusions.

These internal characteristics form naturally while the gemstone develops inside the earth and may include:

• Fine mineral crystals
• Needles
• Feathers
• Fingerprint-like inclusions
• Growth patterns
• Color zoning
• Small fractures

Natural inclusions are not automatically a negative sign. What matters is their type, size, position and visibility.

Which Ruby Inclusions Are More Acceptable?

Small inclusions near the edges of the gemstone may have relatively little impact on its overall appearance.

Fine inclusions that are difficult to notice without magnification may also be acceptable, particularly if the Ruby has strong color and good transparency.

Which Inclusions Can Reduce Ruby Quality?

Large fractures or obvious inclusions located directly in the centre of the stone may negatively affect transparency and visual appeal.

Significant surface-reaching fractures can also affect durability.

A high-quality Ruby should therefore not necessarily be completely flawless. Instead, look for a stone where the inclusions do not severely disturb its beauty, transparency or structural condition.

Should a Natural Ruby Be Completely Flawless?

Not necessarily.

Natural Rubies commonly contain inclusions, and exceptionally clean natural Rubies can be rare and expensive.

A large, perfectly clean Ruby being offered at an unusually low price should be examined carefully.

However, inclusions alone cannot prove that a Ruby is natural. Synthetic Rubies can also contain internal characteristics.

Professional gemological testing remains the safest way to establish whether a Ruby is natural, synthetic, treated or an imitation.

3. Look at Ruby Transparency

Transparency affects how light moves through the Ruby and can influence its brightness and overall appearance.

Rubies may range from relatively transparent to heavily included or opaque.

For fine jewellery and many astrological buyers, a Ruby with good transparency and strong color is often more desirable than a heavily included stone.

When comparing two Rubies, look beyond the surface color.

Ask yourself:

• Does light pass through the gemstone attractively?
• Does the center look lively or dull?
• Are inclusions heavily blocking transparency?
• Does the Ruby maintain good color in normal lighting?

The best choice usually involves a balance of color, transparency, clarity and budget.

4. Check the Quality of the Ruby Cut

A Ruby's cut is not simply its shape.

The quality of the cut determines how effectively the gemstone displays its color and returns light to the viewer.

Common Ruby shapes include:

• Oval
• Cushion
• Round
• Pear
• Emerald cut
• Mixed cut

Oval and cushion shapes are particularly common because they can help cutters preserve weight while displaying attractive Ruby color.

Signs of a Good Ruby Cut

A well-cut Ruby should generally have:

• Balanced proportions
• Reasonable symmetry
• A pleasing face-up appearance
• Good light return
• Minimal overly dark areas
• No excessively visible window through the center
• A shape that displays the color effectively

The purpose of cutting a colored gemstone is not simply to create maximum sparkle.

A skilled cut should bring out the Ruby's natural color while maintaining an attractive shape and usable weight.

What Is a Window in a Ruby?

A "window" is a transparent or washed-out area visible through the centre of some gemstones.

When a Ruby is cut too shallow, light can pass directly through rather than returning toward the viewer.

This can make the centre appear pale or lifeless.

A small degree of windowing may sometimes be acceptable depending on the stone, but a large obvious window can reduce visual appeal.

5. Check Whether the Ruby Is Natural or Synthetic

Before comparing Ruby quality, first confirm exactly what you are buying.

Natural Ruby

A natural Ruby forms within the earth through geological processes.

Synthetic Ruby

A synthetic or lab-grown Ruby is produced in a laboratory.

It can have physical and chemical properties similar to natural Ruby, making professional identification important.

Ruby Imitations

Other red materials may sometimes be sold or mistaken for Ruby.

Examples can include:

• Red spinel
• Garnet
• Colored glass
• Other red gemstones
• Composite materials

6. Ask About Ruby Treatments

Treatment can have a significant effect on the value and desirability of a Ruby.

Some Rubies undergo treatment to improve their color or clarity.

Heat Treatment

Heating is commonly encountered in the colored gemstone market and may improve color or appearance.

A heated Ruby is still a natural Ruby if it originated naturally, but the treatment should be disclosed.

Fracture Filling

Some lower-quality Rubies may have surface-reaching fractures filled with glass or other materials to improve transparency.

These stones can look significantly better after treatment, but they should not be valued or represented in the same way as a comparable untreated natural Ruby.

Other Enhancements

Depending on the stone and market, other enhancement processes may also be encountered.

7. Certification Is Essential When Buying a Valuable Ruby

A gemstone certificate provides an independent assessment of the stone.

For a valuable Ruby, the certificate should ideally confirm important information such as:

• Whether the stone is natural
• Gemstone identification
• Carat weight
• Measurements
• Color information where applicable
• Treatment status
• Origin where tested and stated
• Report number

A certificate becomes especially important when the seller is making claims such as:

• Natural Ruby
• Untreated Ruby
• Unheated Ruby
• Burmese Ruby
• Mozambique Ruby
• Pigeon Blood Ruby

The more valuable the claim, the more important independent verification becomes.

How to Check a Ruby Certificate

1. Report Number

Check whether the laboratory provides an online verification facility and confirm that the report number matches.

2. Gemstone Identification

The document should clearly identify the stone you are buying.

3. Weight

Make sure the carat weight on the certificate matches the gemstone and the seller's listing.

4. Measurements

Compare the listed dimensions with the actual stone whenever possible.

5. Treatment

Look for clear wording about heat or other detected treatments.

6. Origin

If you are paying extra for a claimed geographical origin, check whether the laboratory report supports that origin.

You can also read our gemstone certification guide to understand what information you should check before purchasing.

8. Does Ruby Origin Affect Quality and Price?

Rubies are found in several parts of the world, including Myanmar, Mozambique, Thailand, Sri Lanka and other regions.

Different deposits can produce Rubies with different combinations of:

• Color
• Inclusions
• Fluorescence
• Transparency
• Crystal characteristics

Some geographical origins have stronger historical reputations and may command a premium.

However, origin alone does not determine whether a Ruby is beautiful or high quality.

A fine Ruby from one region can be more attractive than a lower-quality Ruby from a more famous source.

For expensive stones, never pay a major origin premium based only on a seller's verbal claim.

9. Consider Carat Weight After Quality

Ruby prices can increase significantly as carat weight increases, particularly when good color, clarity and treatment status are maintained.

However, choosing the biggest Ruby within your budget is not always the best strategy.

For example, you may have a choice between:

• A larger Ruby with weak color and heavy inclusions
• A smaller Ruby with richer color and better transparency

For jewellery, the smaller but better-quality stone may provide a more attractive appearance.

For astrology, carat or ratti requirements may also be important, so balance your astrologer's recommendation with gemstone quality and budget.

10. Compare Ruby Stones in Different Lighting

Lighting can significantly change how a Ruby appears.

Before making a final decision, examine the stone under:

• Natural daylight
• Indoor white light
• Warm indoor lighting

A good Ruby should maintain an attractive appearance across normal viewing conditions.

Online buyers should request clear photographs or videos of the actual Ruby rather than relying only on highly edited product photos.

This makes it easier to evaluate color, transparency, inclusions and overall appearance before buying.

11. Choose Ruby Quality According to Your Purpose

Not every buyer needs the same Ruby.

Ruby for Astrology

If you are purchasing Ruby or Manik stone for astrology, first confirm the recommended weight and other requirements with your astrologer.

Many astrological buyers prefer natural stones with good transparency and clearly disclosed treatments.

Certification is particularly useful because it helps confirm that the stone is natural and identifies detectable enhancements.

Ruby for Jewellery

For jewellery, color, appearance, durability, cut and how the stone looks once mounted may receive greater priority.

Ruby for Collecting or Investment

Buyers considering rare or high-value Rubies should pay especially close attention to treatment status, laboratory certification, provenance, origin evidence and overall rarity.

12. Common Mistakes to Avoid When Buying a Ruby

Avoid making your decision based only on one factor.

Common mistakes include:

• Choosing only by carat weight
• Assuming darker red means better quality
• Believing every flawless Ruby is natural
• Ignoring treatment disclosure
• Paying a premium for unsupported origin claims
• Buying without independent certification
• Comparing prices without comparing quality
• Judging a Ruby only from edited photographs
• Confusing synthetic Ruby with natural Ruby
• Assuming every "pigeon blood" description is laboratory confirmed

A high-quality Ruby should be evaluated as a complete gemstone, not simply by its size or color name.

Ruby Quality Checklist Before You Buy

Use this checklist before purchasing a natural Ruby:

• Confirm the Ruby is natural.
• Examine the color and saturation.
• Check whether the stone is too dark or too light.
• Review clarity and visible inclusions.
• Look at transparency.
• Examine cut and symmetry.
• Check for excessive windowing.
• Confirm exact carat weight.
• Ask whether the Ruby has been heated or otherwise treated.
• Request independent gemological certification.
• Verify premium origin claims.
• Compare actual images or videos.
• Review the seller's return and verification policies.

How to Choose the Best Ruby Within Your Budget

Instead of searching for a "perfect Ruby," look for the best balance within your budget.

A practical priority order is:

Your priorities may differ depending on whether the Ruby is intended for astrology, jewellery or collecting.

For many buyers, choosing a slightly smaller Ruby with better color and transparency can provide better overall quality than choosing a larger stone with poor appearance.

Buying a Natural Ruby Stone From Shirali Gems

At Shirali Gems, buyers can explore natural Ruby or Manek stones for astrology and jewellery.

Our approach focuses on helping customers understand important gemstone characteristics such as natural identity, color, treatment status, origin, carat weight and certification before purchase.

For eligible gemstones, independent laboratory certification provides additional verification of important gemstone details.

If you are comparing multiple Rubies, you can also request guidance and view available stones before choosing the option that best matches your purpose and budget.